Using in a ruger pcc - Magpul Industries PMAG GL9 Glock 17/19/26/34/45 9mm Luger 21 Round Pistol Magazine

These seem ok for the money. I bought them to use in a Ruger PC carbine and they function well for that. No problems except one mag freshly opened had the follower wedged in almost sideways. But I straightened it out and it seems OK. The springs are very stiff and I couldnt load more than a few rounds at first. They do seem to be loosening up so more use will tell.
Also, these aren’t metal lined like original Glock mags are. I kinda wanted those for USPSA matches but I’ll give these sometime before I dismiss them .
Some might wonder why the 21 rounds. I find the length easier to handle than the 33 round mags.and 21 rounds is enough for most stages, with 17 rounds not being enough. If mag changes are required, then it won’t matter how many rounds those hold.